@echo off
setlocal enableextensions enabledelayedexpansion

REM creates or updates version_auto.h
REM params: $1=filename (usually version_auto.h), $2=VARNAME (usually VGMSTREAM_VERSION)


REM defaults
set VERSION_DEFAULT=unknown
set VERSION_FILE=%1
set VERSION_NAME=%2
if "%~1" == "" set VERSION_FILE=version_auto.h
if "%~2" == "" set VERSION_NAME=VGMSTREAM_VERSION

if not "%VERSION%"=="" set VERSION=!VERSION:^:=_!

cd /d "%~dp0"


REM try get version from Git (dynamic)
:get_version_git
for /f %%v in ('git describe --always') do set VERSION=%%v
if not "%VERSION%"=="" set VERSION=!VERSION:^:=_!
if "%VERSION%"=="" goto :get_version_h
if %VERSION%==%VERSION_DEFAULT% goto :get_version_h
set LINE=#define %VERSION_NAME% "%VERSION%" /* autogenerated */
echo %LINE% > %VERSION_FILE%
goto :exit


REM try to get version from version.h (static)
:get_version_h
echo Git version not found, can't autogenerate version_auto.h
set LINE=#define %VERSION_NAME% "%VERSION_DEFAULT%" /* autogenerated */
if exist "version.h" (
    for /F "tokens=*" %%v in (version.h) do (
        set TOKEN=%%v
        REM set COMP=#define %VERSION_NAME% #todo
        if /i "!TOKEN:~0,25!"=="#define VGMSTREAM_VERSION" set LINE=%%v
    )
)

echo %LINE% > %VERSION_FILE%
goto :exit


REM done
:exit